:relfileprefix: ../../../
[#boost-urls-ipv6_address-is_v4_mapped]

= xref:boost.adoc[pass:[boost]]::xref:boost/urls.adoc[pass:[urls]]::xref:boost/urls/ipv6_address.adoc[pass:[ipv6_address]]::is_v4_mapped


Return true if the address is a mapped IPv4 address


== Synopsis

Declared in header `<https://www.github.com/boostorg/url/blob/develop/include/boost/url/ipv6_address.hpp#L288[boost/url/ipv6_address.hpp,window=blank_]>`

[source,cpp,subs="verbatim,macros,-callouts"]
----
bool
is_v4_mapped() const noexcept;
----

== Description


This address type is used to represent the
addresses of IPv4 nodes as IPv6 addresses.

=== Specification

* link:https://datatracker.ietf.org/doc/html/rfc4291#section-2.5.5.2[            2.5.5.2. IPv4-Mapped IPv6 Address (rfc4291)]